def __init__(self, tokenizer):
"""
Creates a new compilation engine with the given tokenizer.
"""
if not tokenizer or not tokenizer.filename:
raise TypeError('Tokenizer not valid.')
filename = re.sub('.jack$', '.vm', tokenizer.filename)
self.tokenizer = tokenizer
self.vm_writer = VMWriter(filename)
self.symbol_table = SymbolTable(filename)
self.classname = self.get_classname(filename)
self.tokenizer.seperate_all()
# Different keywords and operators partition to digest
# the structure of program.
self.class_var_dec = ['static', 'field']
self.subroutines = ['constructor', 'function', 'method']
self.statements = ['let', 'do', 'if', 'while', 'return']
self.ops = ['+', '-', '*', '/', '&', '|', '<', '>', '=']
self.unary_ops = ['~', '-']
# Determines the current subroutine in use.
self.current_fn_type = None
self.current_fn_name = None
self.if_idx = 0
self.while_idx = 0
self.verbal_arithemtic = {
'>': 'GT',
'<': 'LT',
'=': 'EQ',
'|': 'OR',
'-': 'SUB',
'+': 'ADD',
'&': 'AND'
}
self.verbal_unary = {'~': 'NOT', '-': 'NEG'}
